Overlord II
50 Achievements
23-28h
PS3
Ultimate Collector
Collect 100% of all Dark Crystals.
2.5%
How to unlock the Ultimate Collector achievement in Overlord II - Definitive Guide
Arkzein
TrueAchievements
TrueAchievements
I have maps for these also here: http://www.xbox360achievements.org/forum/showpost.php?p=2114...
There are 30 Dark Crystals scattered throughout the game. Note: this is not enough to forge every item and upgrade all minions, take this into account if going for those achievements, however you should have enough to unlock all the achievements if being careful with what you buy, even if not using multiple saves.
Netherword Tower (5)
These should all be easy enough to find and are all in plain sight:
* [1] The main chamber, on the platform around the edge of the chamber
* [2] In your bedchambers, right at the back of the chamber.
* [3] In the forge near the bellows (on the left past your armoury, where you upgrade your minions)
* [4] In the Minion burrows chamber, there is one at the end of a dead end bridge past the red minion hive/area and
* [5] another on a path just around from the blue minions.
Nordberg Sanctuary (1)
* [6] Just after you slide down a hill and have to leave your brown minions behind, this crustal is in among the roots to the left beside the Gnome Burrows.
Nordberg (2)
* [7] After you use the mine cart to destroy the gate and clear the Empire soldiers with the ballista, this Crystal is just inside the gate to your left behind some rocks, get another mine cart and send it into the town as you did with the gate then destroy ti to gain access.
* [8] After you have dealt with Barius and conquered Nordberg, return via Netherworld Gate 2. Head left past the Mayor House and the Balista and left again to head out the northern gate, follow the winding round around to the left (it goes around the back of the Mayor's house) and this Crystal will be at the end.
Everlight Reef (2)
* [9] Just after you pick up the first red stone this Crystal is in the water to your right as you move along the path, just after destroying a hut blocking the road. You'll have to return here with Blue minions to pick this up later in the game.
* [10] After placing the yellow stone you'll come to a sandy area filled with mermaids, to get there you have to head down two flights of stairs, after the first set of stairs turn right and the Crystal is on a ledge/varge only your minions can reach.
Everlight Jungle (1)
* [11] After defeating the two fat eleves in the Northern Area of the map (the part you needed the green minions to enter) head through the newly opened passageway and take the first right. The crystal is in this section in one of the rocky alcoves.
Everlight Facility (3)
* [12]After you possess the Green minions and enter the facility you will soon come across the Green Minion Hive, just beside it is a 5 minion switch, sweep them over it to open up a small area filled with crates, a couple of treaure chests and the Crystal.
* [13]This is one of the most easily missed. Far over in the north eastern part of the map (best gotten when you release the first Panda using the 5 minion switch during the quest to retrieve the green minion hive) this crystal is found by entering a grate hidden in shodow at the back of the panda cage, then after destroying the pots in the next area long thin beam. Only accessible when you have possessed minions.
* [14] At the Northern part of the Map, in one of the pens that you release the two Pandas from, again best done during the Green Minion Hive Quest.
Everlight Temple Outskirts(1)
* [15]You'll see this crystal high on a ledge just as you exit the area's Nethordworld Gate however you cannot reach it until you have the spider mounts for your greens. You'll return here with them after defeating the spider boss, indeed you need spider mounts to open the main gate to the next area by pushing minion switches on the walls only they can reach, so remember to pick it up then.
Everlight Temple (1)
* [16] After defeating the Spider boss and ascending the lift using your greens take the first set of stairs to your right, just before you reach the Netherworld gate to reach a 1-minion switch, Activate it to open a secret area. Head up the stiras to the left of the gate then turn right, picking up a mana upgrade on your way if you haven't already, to enter the room with gold chests and this crystal.
Everlight Town (1)
* [17] You need the Blue minions for this crystal, so return only when you have them. From Netherworld Gate 1 (The one in the area that had the Boss fight and contains the Governess and Treasure Chests) head out and take the left hand path, this will bring you to the Beech. Keep left and cross the water to the the island, this will hold a spell catalyst if you haven't already picked it up. There is a minion accessible area on the southern part of the Island with this Dark Crystal, hit RT to send your minions down the path to retrieve it for you.
Empire Harbour (1)
* [18] After disguising your minions to enter the fort with the catapult, turn directly left, this Stone is in the corner however, unlike almost every other, it does not shine through the waterjug it's inside. One of the easier ones to miss if you don't destroy every breakable in each area.
Empire Heartlands (1)
* [19] In this area you will have to possess a minion and destroy various Sentinel towers, one one point you'll be faced with two towers too high to reach and a Gargantuan prowling around. Use the Gargantuan's charge to fell the sentinels then kill it (attack when it;s stunned from a Charge) and it will drop a Dark Crystal. This is another easily missed as it's possible to just avoid the Garganuatuan after he destroys the towers.
Empire Sewers (2)
* [20] Under the grating beside the raft you used to reach the Netherworld gate, just your blues (Select the raft with LT and send them to it with RT) and use them to activate the raft (hit A) and to another dock (hit B) and return to the, now accessible, grating. Send in your blues to retrieve the Crystal.
* [21] After your fight in the Arena return with 20 minions (any will do) to the room with the 6-minion wheel. (It's the second puzzle room on the northern part of the map). Partially Hidden by boxes on the left hand size is a 20-minion switch. Activate it and follow the path, killing the Executioners in your way, to find the Dark Crystal.
Wasteland (5)[COLOR=red]
* [22] You can get this Crystal as soon as the Wastelands become available. Take the path around from the Netherworld gate and as soon as you enter the main area head left hugging the wall. The crystal is in an acolve here, just above the Nethwerorld gate on the map.
* [23] You'll need blue minions to advance this deep into the Wasteland, and for all other Crustals in this region. From the first netherworld gate follow the path and pass through the area blocked by two magic goop piles, you'll comp across a human survivor village with a few minion burrows. Activate the minion-wheel and continue on to the next village. Here the Cruysta; is hidden behind one of the houses on the upper level, destroy them to access it. This is in the north-eastern part of the Map.
* [24] After the large rotating stone platform, and just past Netherworld Gate 2, is a Zombie village made of halfling holes. The final command upgrade is behind a breakable barrier which blocks the exit to the north side. Almost impossible to miss within the story progression.The Dark Crystal is underneath a tent right beside this.
* [25] After taking with Quuen Fay and Florian you will gain access to a large lake filled with the magic blue goop. This Crystal is in the northernmost part of it in a thin ring near some green poison jets.
* [26] At the end of the wastelands region you will have to escape from a horde of Empire soldiers along a set path. After a section where you are under fire from archers whilst running up various levels of a cliff this Crystal is in an alcove just before you come to a large slide taking you down to a level near where you met Fay and Florian earlier. It can be difficult to find and get the first time around due to the Archers attacking you, but you can return later if needs be.
Wasteland Sanctuary Depths (1)
* [27] After defeating the Salamander King and Charging the Tower heart at all four Crystals this Dark Crystal will be right in your path on the way out just after you have to fight some empire soliders in a large circular room (you earlier fell down here and had your first encounter with the Salamanders). Almost impossible to miss.
Wasteland Sanctuary Town (1) (Missable)
* [28]When you return to the town after charging the Tower Heart it'll be under attack by the empire troops. Continue until you come to a section where you must push two mother Goddess statues forward to pass, head up the stairs here to a crossroads. Straight ahead is blocked and to the left is a Empire Centurion, take the right path up to a raised platform and destroy everything to get the Crystal. (it is in a barrel with no normal glow, easy to miss). Warning: You cannot return to the Wasteland Sanctuary Town Area later on, you must get this Crystal the one and only time you are here.
Empire Hills (1)
* [29] You need Kelda as your first Mistress to have the wolf mounts available for this Crystal. After the second catapult battle (where you destroyed 3 siege towers) you'll come to an area with 6 bombers, use them to break the barriers and have your minions deal with them. this crystal is across the gap (where three of the bombers were) and requires wolves to jump across and collect.
Empire City (1)
* [30] Just before you enter the Emperor's Palace (after destroying the last shrine with the xombies/townspeople around) take the stairs to the left of the door into the palace. This Crystal is in an umarked jar on the ledge at the top.
There are 30 Dark Crystals scattered throughout the game. Note: this is not enough to forge every item and upgrade all minions, take this into account if going for those achievements, however you should have enough to unlock all the achievements if being careful with what you buy, even if not using multiple saves.
Netherword Tower (5)
These should all be easy enough to find and are all in plain sight:
* [1] The main chamber, on the platform around the edge of the chamber
* [2] In your bedchambers, right at the back of the chamber.
* [3] In the forge near the bellows (on the left past your armoury, where you upgrade your minions)
* [4] In the Minion burrows chamber, there is one at the end of a dead end bridge past the red minion hive/area and
* [5] another on a path just around from the blue minions.
Nordberg Sanctuary (1)
* [6] Just after you slide down a hill and have to leave your brown minions behind, this crustal is in among the roots to the left beside the Gnome Burrows.
Nordberg (2)
* [7] After you use the mine cart to destroy the gate and clear the Empire soldiers with the ballista, this Crystal is just inside the gate to your left behind some rocks, get another mine cart and send it into the town as you did with the gate then destroy ti to gain access.
* [8] After you have dealt with Barius and conquered Nordberg, return via Netherworld Gate 2. Head left past the Mayor House and the Balista and left again to head out the northern gate, follow the winding round around to the left (it goes around the back of the Mayor's house) and this Crystal will be at the end.
Everlight Reef (2)
* [9] Just after you pick up the first red stone this Crystal is in the water to your right as you move along the path, just after destroying a hut blocking the road. You'll have to return here with Blue minions to pick this up later in the game.
* [10] After placing the yellow stone you'll come to a sandy area filled with mermaids, to get there you have to head down two flights of stairs, after the first set of stairs turn right and the Crystal is on a ledge/varge only your minions can reach.
Everlight Jungle (1)
* [11] After defeating the two fat eleves in the Northern Area of the map (the part you needed the green minions to enter) head through the newly opened passageway and take the first right. The crystal is in this section in one of the rocky alcoves.
Everlight Facility (3)
* [12]After you possess the Green minions and enter the facility you will soon come across the Green Minion Hive, just beside it is a 5 minion switch, sweep them over it to open up a small area filled with crates, a couple of treaure chests and the Crystal.
* [13]This is one of the most easily missed. Far over in the north eastern part of the map (best gotten when you release the first Panda using the 5 minion switch during the quest to retrieve the green minion hive) this crystal is found by entering a grate hidden in shodow at the back of the panda cage, then after destroying the pots in the next area long thin beam. Only accessible when you have possessed minions.
* [14] At the Northern part of the Map, in one of the pens that you release the two Pandas from, again best done during the Green Minion Hive Quest.
Everlight Temple Outskirts(1)
* [15]You'll see this crystal high on a ledge just as you exit the area's Nethordworld Gate however you cannot reach it until you have the spider mounts for your greens. You'll return here with them after defeating the spider boss, indeed you need spider mounts to open the main gate to the next area by pushing minion switches on the walls only they can reach, so remember to pick it up then.
Everlight Temple (1)
* [16] After defeating the Spider boss and ascending the lift using your greens take the first set of stairs to your right, just before you reach the Netherworld gate to reach a 1-minion switch, Activate it to open a secret area. Head up the stiras to the left of the gate then turn right, picking up a mana upgrade on your way if you haven't already, to enter the room with gold chests and this crystal.
Everlight Town (1)
* [17] You need the Blue minions for this crystal, so return only when you have them. From Netherworld Gate 1 (The one in the area that had the Boss fight and contains the Governess and Treasure Chests) head out and take the left hand path, this will bring you to the Beech. Keep left and cross the water to the the island, this will hold a spell catalyst if you haven't already picked it up. There is a minion accessible area on the southern part of the Island with this Dark Crystal, hit RT to send your minions down the path to retrieve it for you.
Empire Harbour (1)
* [18] After disguising your minions to enter the fort with the catapult, turn directly left, this Stone is in the corner however, unlike almost every other, it does not shine through the waterjug it's inside. One of the easier ones to miss if you don't destroy every breakable in each area.
Empire Heartlands (1)
* [19] In this area you will have to possess a minion and destroy various Sentinel towers, one one point you'll be faced with two towers too high to reach and a Gargantuan prowling around. Use the Gargantuan's charge to fell the sentinels then kill it (attack when it;s stunned from a Charge) and it will drop a Dark Crystal. This is another easily missed as it's possible to just avoid the Garganuatuan after he destroys the towers.
Empire Sewers (2)
* [20] Under the grating beside the raft you used to reach the Netherworld gate, just your blues (Select the raft with LT and send them to it with RT) and use them to activate the raft (hit A) and to another dock (hit B) and return to the, now accessible, grating. Send in your blues to retrieve the Crystal.
* [21] After your fight in the Arena return with 20 minions (any will do) to the room with the 6-minion wheel. (It's the second puzzle room on the northern part of the map). Partially Hidden by boxes on the left hand size is a 20-minion switch. Activate it and follow the path, killing the Executioners in your way, to find the Dark Crystal.
Wasteland (5)[COLOR=red]
* [22] You can get this Crystal as soon as the Wastelands become available. Take the path around from the Netherworld gate and as soon as you enter the main area head left hugging the wall. The crystal is in an acolve here, just above the Nethwerorld gate on the map.
* [23] You'll need blue minions to advance this deep into the Wasteland, and for all other Crustals in this region. From the first netherworld gate follow the path and pass through the area blocked by two magic goop piles, you'll comp across a human survivor village with a few minion burrows. Activate the minion-wheel and continue on to the next village. Here the Cruysta; is hidden behind one of the houses on the upper level, destroy them to access it. This is in the north-eastern part of the Map.
* [24] After the large rotating stone platform, and just past Netherworld Gate 2, is a Zombie village made of halfling holes. The final command upgrade is behind a breakable barrier which blocks the exit to the north side. Almost impossible to miss within the story progression.The Dark Crystal is underneath a tent right beside this.
* [25] After taking with Quuen Fay and Florian you will gain access to a large lake filled with the magic blue goop. This Crystal is in the northernmost part of it in a thin ring near some green poison jets.
* [26] At the end of the wastelands region you will have to escape from a horde of Empire soldiers along a set path. After a section where you are under fire from archers whilst running up various levels of a cliff this Crystal is in an alcove just before you come to a large slide taking you down to a level near where you met Fay and Florian earlier. It can be difficult to find and get the first time around due to the Archers attacking you, but you can return later if needs be.
Wasteland Sanctuary Depths (1)
* [27] After defeating the Salamander King and Charging the Tower heart at all four Crystals this Dark Crystal will be right in your path on the way out just after you have to fight some empire soliders in a large circular room (you earlier fell down here and had your first encounter with the Salamanders). Almost impossible to miss.
Wasteland Sanctuary Town (1) (Missable)
* [28]When you return to the town after charging the Tower Heart it'll be under attack by the empire troops. Continue until you come to a section where you must push two mother Goddess statues forward to pass, head up the stairs here to a crossroads. Straight ahead is blocked and to the left is a Empire Centurion, take the right path up to a raised platform and destroy everything to get the Crystal. (it is in a barrel with no normal glow, easy to miss). Warning: You cannot return to the Wasteland Sanctuary Town Area later on, you must get this Crystal the one and only time you are here.
Empire Hills (1)
* [29] You need Kelda as your first Mistress to have the wolf mounts available for this Crystal. After the second catapult battle (where you destroyed 3 siege towers) you'll come to an area with 6 bombers, use them to break the barriers and have your minions deal with them. this crystal is across the gap (where three of the bombers were) and requires wolves to jump across and collect.
Empire City (1)
* [30] Just before you enter the Emperor's Palace (after destroying the last shrine with the xombies/townspeople around) take the stairs to the left of the door into the palace. This Crystal is in an umarked jar on the ledge at the top.
6 Comments
I just wanted to add that the link to the maps at the start of this solution contains about half the maps; following the thread on x360a will take you to the rest.
http://www.xbox360achievements.org/forum/showpost.php?p=2114...
Thanks Arkzein for a great detailed solution!
http://www.xbox360achievements.org/forum/showpost.php?p=2114...
Thanks Arkzein for a great detailed solution!
By vladigor03 on 16 Jul 2009 09:27
The information is excellent. Too bad it is a direct copy of http://www.xbox360achievements.org/game/overlord-ii/guide/
By McD76 on 09 May 2010 08:09
Cauchy, MoosePS3T
See this thread for locations: Collectibles Guide with maps.
Stratege
stratege.ru
stratege.ru
This guide was translated automatically.
There are thirty black crystals in total in the game. They are not enough to buy all the upgrades and make all the items, but if done correctly they will be enough to get all the trophies even without using multiple saves. Please note that the twenty-eighth crystal is very easy to miss, and if you miss it, you will have to completely replay the game to get it. Detailed locations of all crystals are available in a special mini guide .
BigMan161
stratege.ru
stratege.ru
This guide was translated automatically.
1 - Throne Room of the Tower, on the side balcony.
2 - location of the Minion Dwellings in the Tower. In a dead end next to a hive of blue minions.
3 - location of the Minion Dwellings in the Tower. Near the rope bridge near the red minion hive.
4 - personal chambers in the Tower. On the pointed balcony.
5 - Tower Forge, next to the giant bellows.
6 - Nordberg's Vault Cave. Near where you first find the red minions.
7 - City of Nordberg. After you have used explosives to open the gate to Nordberg, send the cart to the gate again and blow it up - a stone blockage on the side of the gate will open.
8 - Everlight Reef. There are flooded ruins near the red keystone, which the Overlord cannot reach due to the depth of the water. Get there with blue minions.
9 - Everlight Reef. After you have placed the yellow key stone on the pedestal, go down to the sandbank where a lot of fat mutant half-mermaids, half-fish-hedgehogs are hanging out. From the red and brown minion portals next to the yellow keystone, go down one flight of stairs down to the sandbank. Stop at the bottom of the steps, turn right and send minions after the dark crystal.
10 - Everlight Jungle (Jungle of Eternal Light). Find the green minions for the first time and after you pass two fat elves mowing down the Mother Goddess, go to the northern edge of the map and send the minions for the crystal along the shore of the deep bay to the end.
11 - Everlight Facility - in the northern edge of the Factory (ground level), west of the pandas. Use minions to push the platform.
12 - Everlight Facility (Eternal Light Plant) - eastern wing of the Plant. A cave that leads outside to some sort of waste disposal area.
13 - Everlight Facility - after using the possession stone and moving into the body of a minion, go to the small gate opened by five minions next to the green hive. The gate leads to a room with a crystal.
14 - Everlight Temple - in the secret room at the top of the temple after you have defeated the Spider Boss.
15 - Everlight Town Resort. Find the web next to the Underdark Gate. To get to the top, send green minions there riding spiders.
16 - Everlight Town Resort. Use the blue minions to get to the island where the spell catalyst is also located. Let them cross the small bridge to the end.
17 - Nordburg (Nordberg). Find the ballista in the northeastern part of the city, near where you defeated Borius and go north through the gate. At the end of the path where you started playing as a little Overlord there is a crystal.
18 - Empire Harbor. In the ground corner of the fortress with a catapult.
19 - Empire Heartland (Central Lands of the Empire). Kill the Gargantuan after destroying all the Guardians on the main road to get the crystal.
20 - Empire Sewer. Near the Underdark Gate. Next to the raft you used to cross the river, under the grate. Use the blue minions to drag the raft and send them to get the crystal.
21 - Empire Sewer. Next to the room where you used the crane to mine the four blue minions, there is a platform that requires 20 minions to press.
22 - Wasteland (Wasteland). The nook directly north of the Underdark Gate (Gate 1). This crystal can be obtained when you receive blue minions.
23 - Wasteland (Wasteland). In the northwestern part of the map next to the zombie settlement, which is located next to the entrance to the Wasteland Vault.
24 - Wasteland (Wasteland). The northern zombie settlement is next to the magical pool where the artifact of life is located. The crystal is located behind one of the shacks.
25 - Wasteland (Wasteland). Near a large lake of magical "radioactive waste". The crystal is located in the northeastern part of the lake.
26 - Wasteland (Wasteland). While escaping from the Imperial forces, you will reach an S-shaped bend on a cliff. At the top of this bend pointing southwest there is a rise that can only be climbed by minions. The crystal is on the side of the road before where you slide down to the entrance to the Vault.
27 - Wasteland Sanctuary. On the way to the exit after destroying all four shrines, there is a red hollow where archers with fire arrows stand. Behind them is a path leading to the exit from the Vault. The crystal is right on the trail.
28 - Wasteland Sanctuary Town (one-time chance). On the way back to the Fairy Queen after destroying the shrines in the city, there is a place where the minions push two statues to protect the Overlord from the arrows of the archers. Immediately after this point you will find a lone centurion at the fork of several stairs and alleys. Climb the stairs leading up to the elven lodge. The crystal is hidden there, among a pile of broken things. If you have already completed the quest about the Heart of the Tower and obtained the last Mistress, then you will not be able to enter this location again and take the crystal.
29 - Empire Hills. Behind the second Underdark catapult, next to the health artifact. Use the minions on the wolves to reach the platform across the moat.
30 - Empire City. On one of the ramparts at the gate to Solarius's palace
2 - location of the Minion Dwellings in the Tower. In a dead end next to a hive of blue minions.
3 - location of the Minion Dwellings in the Tower. Near the rope bridge near the red minion hive.
4 - personal chambers in the Tower. On the pointed balcony.
5 - Tower Forge, next to the giant bellows.
6 - Nordberg's Vault Cave. Near where you first find the red minions.
7 - City of Nordberg. After you have used explosives to open the gate to Nordberg, send the cart to the gate again and blow it up - a stone blockage on the side of the gate will open.
8 - Everlight Reef. There are flooded ruins near the red keystone, which the Overlord cannot reach due to the depth of the water. Get there with blue minions.
9 - Everlight Reef. After you have placed the yellow key stone on the pedestal, go down to the sandbank where a lot of fat mutant half-mermaids, half-fish-hedgehogs are hanging out. From the red and brown minion portals next to the yellow keystone, go down one flight of stairs down to the sandbank. Stop at the bottom of the steps, turn right and send minions after the dark crystal.
10 - Everlight Jungle (Jungle of Eternal Light). Find the green minions for the first time and after you pass two fat elves mowing down the Mother Goddess, go to the northern edge of the map and send the minions for the crystal along the shore of the deep bay to the end.
11 - Everlight Facility - in the northern edge of the Factory (ground level), west of the pandas. Use minions to push the platform.
12 - Everlight Facility (Eternal Light Plant) - eastern wing of the Plant. A cave that leads outside to some sort of waste disposal area.
13 - Everlight Facility - after using the possession stone and moving into the body of a minion, go to the small gate opened by five minions next to the green hive. The gate leads to a room with a crystal.
14 - Everlight Temple - in the secret room at the top of the temple after you have defeated the Spider Boss.
15 - Everlight Town Resort. Find the web next to the Underdark Gate. To get to the top, send green minions there riding spiders.
16 - Everlight Town Resort. Use the blue minions to get to the island where the spell catalyst is also located. Let them cross the small bridge to the end.
17 - Nordburg (Nordberg). Find the ballista in the northeastern part of the city, near where you defeated Borius and go north through the gate. At the end of the path where you started playing as a little Overlord there is a crystal.
18 - Empire Harbor. In the ground corner of the fortress with a catapult.
19 - Empire Heartland (Central Lands of the Empire). Kill the Gargantuan after destroying all the Guardians on the main road to get the crystal.
20 - Empire Sewer. Near the Underdark Gate. Next to the raft you used to cross the river, under the grate. Use the blue minions to drag the raft and send them to get the crystal.
21 - Empire Sewer. Next to the room where you used the crane to mine the four blue minions, there is a platform that requires 20 minions to press.
22 - Wasteland (Wasteland). The nook directly north of the Underdark Gate (Gate 1). This crystal can be obtained when you receive blue minions.
23 - Wasteland (Wasteland). In the northwestern part of the map next to the zombie settlement, which is located next to the entrance to the Wasteland Vault.
24 - Wasteland (Wasteland). The northern zombie settlement is next to the magical pool where the artifact of life is located. The crystal is located behind one of the shacks.
25 - Wasteland (Wasteland). Near a large lake of magical "radioactive waste". The crystal is located in the northeastern part of the lake.
26 - Wasteland (Wasteland). While escaping from the Imperial forces, you will reach an S-shaped bend on a cliff. At the top of this bend pointing southwest there is a rise that can only be climbed by minions. The crystal is on the side of the road before where you slide down to the entrance to the Vault.
27 - Wasteland Sanctuary. On the way to the exit after destroying all four shrines, there is a red hollow where archers with fire arrows stand. Behind them is a path leading to the exit from the Vault. The crystal is right on the trail.
28 - Wasteland Sanctuary Town (one-time chance). On the way back to the Fairy Queen after destroying the shrines in the city, there is a place where the minions push two statues to protect the Overlord from the arrows of the archers. Immediately after this point you will find a lone centurion at the fork of several stairs and alleys. Climb the stairs leading up to the elven lodge. The crystal is hidden there, among a pile of broken things. If you have already completed the quest about the Heart of the Tower and obtained the last Mistress, then you will not be able to enter this location again and take the crystal.
29 - Empire Hills. Behind the second Underdark catapult, next to the health artifact. Use the minions on the wolves to reach the platform across the moat.
30 - Empire City. On one of the ramparts at the gate to Solarius's palace